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Downloads
All documents in the overview
News & Press
All news at a glance
Request
Send us a message
Copyright © 2010-2021 Shanghai Gehang Vacuum Technology Co.,Ltd. All Rights Reserved.
2019 the Fifteenth International Vacuum Technology Exhibition
Exhibition time: 2019-5-15 to 2019-5-17 Application deadline: 2019-4-10 Exhibition time: 2019-5-15 to 2019-5-17 Exhibition area: Shanghai / Xuhui District Scope of exhibition: 1. Vacuum equipment; 2. Vacuum application equipment; 3. Vacuum measuring instrument, vacuum leak detector, etc. 4. Vacuu...
vacuum oil quenching furnace and vacuum gas quenching furnace difference
Vacuum oil quenching furnace is mainly used for bright quenching and annealing of alloy steel, tool steel, die steel, high speed steel, bearing steel, spring steel, stainless steel and other products. It can be divided into two types: double chamber furnace and three chamber furnace. The double-c...
Precautions for Vacuum Heat Treatment of AISI4140 (42CRMO) Mold Steel or Parts
Die steel contains more alloying elements, and elements with higher vapor pressure (such as AL, Mn, Mn, Cr, Si, Pb, Zn, CU, etc.) tend to evaporate when heated in vacuum, so the vacuum degree of quenching heating should be controlled properly. To prevent the volatilization of alloy elements, espe...
Low pressure gas protection reduces metal element evaporation
To reduce or avoid the evaporation of alloying elements, pressure can be increased by filling the vacuum heating chamber with high-purity neutral or inert gas (such as nitrogen, argon, helium, etc.). The pressure inside the vacuum chamber is adjusted within a range of 0.1 to 650 Pa. This vacuum p...
Vacuum protection atmosphere heat treatment method
Vacuum protection atmosphere heat treatment method–recharge gas selection： When using the partial pressure of heating vacuum heat treatment back filling gas should choose the high-purity neutral or inert gas, hydrogen, helium, nitrogen, argon and other common gases. Four kinds of gas cooling spe...
AISI4140 Steel
AISI4140 is equivalent to China’s 42CrMo steel. 42CrMo steel belongs to ultra high strength steel, with high strength and toughness, high hardenability, no obvious temper brittleness, high fatigue limit after quenching and tempering, multiple impact resistance, good low temperature impact toughne...
Pressure Sealing &Vacuum Sealing Technology of Vacuum Cups
“Tail vacuum” (tubular vacuum) is a traditional process technology and uses “pressure sealing technology”, but it is a pity that this kind of technical measure cannot guarantee the sealing microscopically. In general, there is a tail welding that requires welding three bottoms: inner bottom, mid...
Stainless Steel Vacuum Flask Processing Flow
Stainless steel vacuum flask: It is made of double layer of stainless steel, inner and outer shells. The welding technology is used to combine the inner shell and the outer shell, and then vacuum technology /furnace to pump the air between the inner and outer shell of the flask to vacuum insulati...
Carbonitriding
According to different media, carbonitriding is divided into solid, liquid and gas three kind. Solid carbonitriding is similar to solid Carburizing, and 30% 40% yellow blood salt 10% ammonium carbonate and 50% 60% charcoal are often used as infiltrating agents. This method has low production effi...
Steel Carbonitriding
Carbonitriding refers to a chemical heat treatment process in which carbon and nitrogen atoms penetrate into the surface of the workpiece at the same time. Carbonitriding was first carried out in a salt bath containing cyanide, so it is also called cyanation. The combination of carburizing and ni...